CULTIVATION AND GROWTH 



33 



Wherever broadcast sowing is practiced, some 

 method of covering must be employed. In plowed 

 ground this is done with the common harrow. 

 For corn fields or for firmly packed soil, the shovel 

 cultivator or disc harrow is employed. This is 



FIG. 20. Sowing wheat with a press drill. Some press drills are so made 

 that the weight of the machine is carried on the rear wheels, hence no side wheels 

 are necessary. 



followed by the common tooth harrow for leveling 

 the land. 



Drilling is more general than broadcast sowing 

 in the great wheat districts of the United States. 



Wheat drills are of three general types : Hoe 

 drills, shoe or runner drills, and disc drills. The 



